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IEEJ Transactions on Electronics, Information and systems 2025年第1期145卷 16-24页

作者： Shouno, Kazuhiro Sato, Lina Fukagawa, Kanta Tanimoto, Hiroshi Muto, Cosy Division of Information Engineering University of Tsukuba 1-1-1 Tennoudai Ibaraki Tsukuba305-8573 Japan Graduate School of Science and Technology Degree Programs in Systems and Information Engineering Master’s Program in Computer Science University of Tsukuba Japan Kitami Institute of Technology 165 Koen-cho Hokkaido Kitami090-8507 Japan Faculty of Education Nagasaki University 1-14 Bunkyo-machi Nagasaki852-8521 Japan

This paper proposes a measurement technique for an integrated complex filter. The proposed method is based on two measurement methods with integrated circuitry for calibration. It is accomplished by applying square waves to an FUT (Filter Under Test) instead of sinusoidal waves or by superposing transfer characteristics obtained by applying a single sinusoidal wave to an FUT. In both of the above methods, the output signal connected to the external measurement equipment via a 50 Ω coaxial cable and so on. In this case, the output signal of the FUT should be amplified by internal or external amplifiers, which degrades the response. However, it is cancelled out by the proposed calibration circuitry with some analog switches. In addition to the above, for the RC polyphase filter, the source resistance and the load capacitance degrade the measurement results and their effect is discussed. The validity of the proposal is confirmed through computer simulation for a third-order RCPF whose passband is 8–40 MHz fabricated by Phenitec 0.6 µm CMOS process. It is shown that the measurement error is −1.10 dB for the square-wave method and −1.00 dB and −0.43 degrees for the superposition method at 40 MHz. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Capacitance

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Implementation and Evaluation of 0.6 µm CMOS Complex RCPF for Accurate Frequency Response Measurement

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2025年第1期145卷 25-37页

作者： Sato, Lina Fukagawa, Kanta Shouno, Kazuhiro Tanimoto, Hiroshi Muto, Cosy Moriyama, Seijiro Takahashi, Chikau Yoshino, Michitaka Graduate School of Science and Technology Degree Programs in Systems and Information Engineering Master’s Program in Computer Science University of Tsukuba Japan Division of Information Engineering University of Tsukuba 1-1-1 Tennoudai Ibaraki Tsukuba305-8573 Japan Kitami Institute of Technology 165 Koen-cho Hokkaido Kitami090-8507 Japan Faculty of Education Nagasaki University 1-14 Bunkyo-machi Nagasaki852-8521 Japan Anagix Corporation 3-22-27 Numama Kanagawa Zushi249-0004 Japan Takamori Corporation Japan Research Center for Micro-Nano Technology Hosei University 3-11-15 Midori-cho Koganei Tokyo184-0003 Japan

This paper describes the implementation and evaluation of an RC polyphase filter (RCPF) and circuitry for measuring its frequency characteristics. The integrated circuit is fabricated on a 0.6 µm CMOS process and its supply voltage is 5 V. The integrated circuit includes a filter under test (FUT), a four-phase square wave generator, several analog switches and differential amplifiers to amplify the high-impedance signals of the RCPF. This FUT is a third-order complex RCPF whose passband is 8 − 40 MHz. This paper describes the design of these circuits in detail. This integrated circuit can select two measurement methods by means of external control signals. The first method uses a four-phase square wave. The frequency characteristics are measured by using an on-chip four-phase square wave generator driven by an external clock generator and by a spectrum analyzer tuned to the fundamental frequency. The second method uses an external network analyzer. Furthermore, this integrated circuit is equipped with a calibration circuit to measure the frequency characteristics of the circuitry except FUT by passing through the input / output signals of the FUT. As a result, the frequency characteristics of the FUT itself can be accurately measured. The effectiveness is confirmed through evaluation of the fabricated integrated circuit. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Differential amplifiers

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Effectiveness of human evaluation and human load in acquisition of intelligible fuzzy rules

Effectiveness of human evaluation and human load in acquisit...

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SICE 2003 Annual Conference, SICE 2003

作者： Onisawa, Takehisa Fujihara, Yoshitaka Institute of Engineering Mechanics and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba305-8573 Japan Master's Program in Science and Engineering Onisawa Lab. Institute of Engineering Mechanics and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba305-8573 Japan

ISBN: (纸本)0780383524

Ths pap r discusses the effectiveness of hu an evaluation in the acquisition of fuzzy rules that are proper for situations and intelligible to human. Interactive Genetic Algorithm (Interactive GA) is used for the rules acquisition. Taking car control for running through cran-typed courses as an example, acquired fuzzy rules with human evaluation ad those without human evaluation are eompared with eaeh other. This paper also discusses human load in the evaluation of acquired fuzzy rules. © 2003 SICE.

关键词： Fuzzy rules

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Composition of melody reflecting user's feeling

Composition of melody reflecting user's feeling

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作者： Onisawa, T. Takizawa, W. Unehara, M. Institute of Engineering Mechanics and Systems University of Tsukuba Japan College of Systems Engineering Onisawa Lab. Institute of Engineering Mechanics and Systems University of Tsukuba Japan Master's Program in Science and Engineering Onisawa Lab. Institute of Engineering Mechanics and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba305-8573 Japan

This paper mentions an approach which composes melodies reflecting user's feelings by interactive genetic algorithms. One melody corresponds to a chromosome containing the information such as tone color, tune, the number of notes and the length of notes. Melodies are composed by the use of GA operations. A user listens to presented melodies and evaluates them whether they fit with his/her image of the melody or not. This evaluation process is performed not by objective fitness functions but by humans. Therefore, this approach uses the interactive GA. The chromosome with the best evaluation is chosen as an elite. Elite characteristics are inherited to chromosomes in the next generation. These procedures are repeated until the user finds a melody fitting with the image of the melody. Experiments are carried out in order to confirm the usefulness of the presented approach. The experimental results show that the presented approach composes melodies reflecting user's feelings. © 2000 IEEE.

关键词： Chromosomes

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On a New Rough Clustering Based on Optimization 13

On a New Rough Clustering Based on Optimization

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Joint 13th International Conference on Soft Computing and Intelligent systems and 25th International Symposium on Advanced Intelligent systems, SCIS and ISIS 2024

作者： Furuta, Sakuya Endo, Yasunori Master's Program in Risk and Resilience Engineering Degree Programs in Systems and Information Engineering Graduate School of Science Annd Technology University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki305-8573 Japan Institute of Systems and Information Engineering University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki305-8573 Japan

ISBN: (纸本)9798350373332

The purpose of this study is to develop and investigate a new rough clustering based on optimization. We propose a restructured algorithm using only one variable, instead of the algorithm described using two variables in existing methods. We also perform numerical examples using artificial data and the Iris and Wine datasets. This research has the potential to be used as a method for determining false negatives and false positives in cancer diagnosis. © 2024 IEEE.

关键词： Clustering algorithms

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Real-time recognition of traffic signs using opponent color filters

Real-time recognition of traffic signs using opponent color ...

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14th World Congress on Intelligent Transport systems, ITS 2007

作者： Baba, Kyoko Hirai, Yuzo Master's Program in Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Ten-nodai Tsukuba Ibaraki 305-8573 Japan Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Ten-nodai Tsukuba Ibaraki 305-8573 Japan

ISBN: (纸本)9781617387777

In order to assist driver's vision, a real-time recognition system for traffic signs is proposed. After detecting sign candidates, biologically inspired opponent-color filters are used to extract symbol parts of signs. After normalizing the size of symbol, structural features are calculated to identify the sign. 5572 segmented images are used to design the algorithm. In a real-time system, the same sign in a sequence of frames is tracked, and a majority vote is used to integrate the recognition results. For test data, 93.8% recall rate and 99.3% precision rate could be attained. In-vehicle experiment also showed high recall and precision rates.

关键词： Traffic signs

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Regularized rough c-means and applications to risk analysis 5

Regularized rough c-means and applications to risk analysis

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5th International Symposium on Computational Intelligence and Industrial Applications, ISCIIA 2012

作者： Kinoshita, Naohiko Endo, Yasunori Miyamoto, Sadaaki Master's Program in Risk Engineering University of Tsukuba Ibaraki305-8573 Japan Faculty of Engineering Information and Systems University of Tsukuba Ibaraki305-8573 Japan International Institute for Applied Systems Analysis Schlossplatz 1 LaxenburgA-2361 Austria

Clustering is one of the method of data analysis. Rough clustering based on rough set representation is focused because of the effectiveness. Rough c-means (RCM) by Lingras et al. [1, 2] is one of rough clustering algorithms. The assumptions and the way to calculate cluster centers are useful. Moreover objective-based clustering algorithms based on RCM are discussed (e.g., Ref.[3]). However, all RCM and its variations have a parameter "threshold" to determine degree of belongingness of objects to lower and upper approximations of each cluster, and the existence of the parameter prevents from deriving the degree of belongingness on the way of optimization. This paper shows a new rough clustering algorithm without the parameter "threshold". The both of cluster centers and the degrees of belongingness are derived as solutions of an optimization problem. Moreover, the paper verifies effectiveness of the proposed algorithm for risk analysis with comparison to other algorithms through datasets of UCI Repository.

关键词： Clustering algorithms

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Account reachability: A measure of privacy risk for exposure of a user's multiple SNS accounts 13

Account reachability: A measure of privacy risk for exposure...

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15th International Conference on Information Integration and Web-Based Applications and Services, iiWAS 2013

作者： Yoshikuni, Ayano Watanabe, Chiemi Dept. of Computer Science Master's Program Ochanomizu University 2-1-1 Otsuka Bunkyo-ku Tokyo 112-8610 Japan Faculty of Engineering Information and Systems Tsukuba University 1-1-1 Tennoudai Tsukuba Ibaraki 305-0006 Japan

ISBN: (纸本)9781450321136

With the increased worldwide popularity of social networking services (SNSs), the leakage of a user's private information is becoming a serious problem. An increased number of users now have multiple accounts on various social networks and they tend to use each account to write different user experiments. Aggregating information from different accounts leads to the unintended leakage of personal information. Therefore, we argue that SNS users should be vigilant in protecting the relationship between multiple accounts. In this paper, we propose the use of Account Reachability, a measure of privacy risk which demonstrates the possibility of a stranger finding a user's private account based on information in their public account. In addition, we present ARChecker, a tool to calculate the value of account reachability. ARChecker also provides advice on how to modify the user's profiles and messages to decrease the privacy risk. By checking the privacy measure and modifying the profiles and messages of their SNS accounts, users can protect their multiple accounts from the risk of an unintended leakage of personal information. © 2013 ACM.

关键词： User profile

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Sizing the navy's strategic reserve of ozone-depleting substances

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NAVAL ENGINEERS JOURNAL 2000年第6期112卷 17-25页

作者： Breslin, DA Smith, DE Toms, GS [?]1David A. Breslin P.E. is the Director of Technical Operations for the Naval Surface Warfare Center and is the Chairperson of ASNE'S Committee on Environmental Engineering. He received a master of science degree in aerospace engineering from Virginia Polytechnic Institute (VPI) a master of engineering administration degree in industrial and systems engineering from VPI and a bachelor of engineering degree in mechanical engineering from Stevens Institute of Technology. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command'S CFC & Halon Elimination Program and played a critical role in establishing the Navy'S strategic reserve of ozone-depleting substances. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recognition of “exceptional contributions to global environmental protection”.

The domestic production of the most powerful Ozone-Depleting Substances (ODSs) has permanently ceased and the abundant supplies of a number of refrigerants, fire-fighting agents, and solvents, once taken for granted, are now a thing of the past. ne Navy has adopted a successful strategy for addressing the threat posed by the unavailability of ODSs. That strategy includes relying on a strategic reserve of ODSs. Considering that the strategic reserve will play a critical role in sustained fleet operations well into the next century, it is important to record the history of the reserve and to document lessons learned in order to educate future generations that may be faced with similar challenges. This is the second of three papers that will cover all aspects of the Navy's strategic reserve of ODSs. The first paper documented the history of the Navy's effort to size, establish, and monitor a reserve designed to support fleet operations until-the middle of the next century (1). This paper addresses in detail the process used to estimate the required size of the reserve, including the survey method, statistical analyses, and sizing algorithms. The third paper will discuss the development of the plan for monitoring the reserve including the control mechanisms, regression methods, and statistical-process-control techniques (2).

关键词： Survey Methodology Fleet management Refrigerants Ozone depleting substances strategic reserves

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Development of numerical procedure for thermal hydraulic design of nuclear reactors with advanced two-fluid model (applicability of turbulent dispersion force model for middle diameter vertical pipe)

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japa...

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Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B 2011年第776期77卷 987-991页

作者： Hosoi, Hideaki Yoshida, Hiroyuki Univ. of Tsukuba Graduate School of Systems and Information Engineering Master's Program 1-1-1 Tennoudai Tsukuba Ibaraki 305-8573 Japan

An advanced two-fluid model has been developed in Japan Atomic Energy Agency (JAEA). In this model, an interface tracking method is combined with a two-fluid model. In this procedure, liquid clusters and bubbles larger than a computational cell are calculated using the interface tracking method, and those smaller than a cell are simulated by the two-fluid model. A turbulent dispersion force term is one of the most important constitutive equations for advanced two-fluid model. We have developed the new model for turbulent dispersion force and verified the developed model using the 3-dimensional two-fluid model code ACE-3D, and the comparisons between the results of the analyses and air-water two-phase flow experiments in 200 mm diameter pipe. In this study, to verify the applicability of developed model for middle diameter vertical pipe, we compared between the analyses of results and air-water two-phase flow experiments in 38 mm diameter pipe. © 2011 The Japan Society of Mechanical Engineers.

关键词： Constitutive equations

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